Yesterday, Tweetbotreceived a small but necessary update. Now, another popular Twitter client for iOS has also received a new update. The app is none other than Twitterrific, and its new 5.1 update is nothing if not significant.

The latest update to Twitterrific, which was relaunched to much acclaim in December last year, brings several new features bundled with tons of new improvements.

First and foremost, Twitterrific 5.1 introduces “muffling,” its take on the muting feature that has long been available in Tweetbot.

Twitterrific’s muffling feature enables you to mute users, hashtags, and domains on your Twitter timeline. It lets you tap and hold on a user, hashtag, or domain to muffle the item. Similarly, it lets you tap and hold on any muffled item to un-muffle the item. Muffled items are synced across devices via iCloud.

Now, here’s where Twitterrific’s muffling differs substantially from Tweetbot’s muting. Instead of completely hiding all affected items from your timeline, as in Tweetbot, Twitterriffic just minimizes muffled tweets. You can tap on any muffled tweet to “peek” at it and tap on it again to close it.

Twitterrific 5.1 also adds support for three new image hosting services, namely, Img.ly, Mobypicture, and Twitpic. Further, it adds the Avenir font, which is exclusive to iOS 6.

Note that Twitterrific’s pull-to-refresh animation featuring Ollie the bird has been slightly redesigned. Apparently, it has been altered so as to differentiate it from Ollie’s “brother from another mother,” Larry, which is Twitter‘s official logo.

But don’t worry. Twitterrific developer The Iconfactory promises that Ollie will return in … Octopushy.

Hmmm … Octopushy … OctoPUSHy!

That’s right: the much-requested push notification feature is finally coming to Twitterrific through its next update. The Iconfactory says as much in the above video, which demos the aforementioned new features in Twitterrific 5.1.